I first heard of these from Sonia Choquette. She recommended exploring cards/tools to develop intuition.  Now that I explored this extensively, I  understand why she said that.  These 40 cards have medieval art and rely on symbols. Some cards are similar to the Major Arcana but there are new ones like yes, no, now and never. The groupings are fundamentals, seven archetypes, seven symbols, seven characters and seven happenings. The cards may be used as as any card deck, either as a game, or as a serious tool for questions.
Jung placed great importance on symbols and archetypes and argued we make sense of our world through them, which is true. People use symbols for marketing to make a point, express a viewpoint or themselves. Dreams communicate powerfully though symbols. How many times has your friend said to you "well that meant to me..... for sure."? I rest my case.

Caroline Myss has a wonderful book Soul contracts where she discusses archetypes. Archetypes are just that, roles that we each play as we enact our soul contracts with one another as we learn our lessons. She states we have 12 and has created a deck for this. I find it useful if you are puzzled by your recent behavior to draw 12 cards and ask yourself why am I doing this now? I feel all humans are everchanging beings of energy so you never really are the same person from one year to the next.
 If you get Child, are you feeling the need to be childish/ How does it serve you now, in this instance? Or the Queen,. I know you are regal, we all are, andt everyone has the special precious quality in them. It is ok for you to expect the best, Just remember to extend the best to everyone in your path. See what I am getting at?
The deck has a way of letting you see what you are not seeing about your self. You can make a list of the roles you believe you are and see how they are interacting with you and others around you. Examining them only promotes harmony and understanding.